Writing instrument



FIG. 1 is a top, front, left perspective view of a writing instrument inaccordance with my design;

FIG. 2 is a bottom, front, right perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom view thereof.

The dotted lines shown form no part of the claimed design.

CLAIM The ornamental design for a writing instrument, as shown anddescribed.